In unit 6,
students will learn that angles are geometric shapes made of two rays.Students will learn to measure angles in
degrees using a circular protractor and to sketch angles of a certain
measure.Students will learn three
types of angles, right, acute and obtuse.Students will learn that the sum of angle measurements around a point
is 360 degrees and the sum of angle measurements on a line is 180
degrees.Students will use this
knowledge to find unknown angles.Students will solve addition and subtraction problems to find unknown
angles on a diagram in real world and mathematical problems.

Students
build, draw and analyze two dimensional shapes in geometry.Students will draw and identify points,
lines, line segments, rays, angles, and perpendicular and parallel
lines.Students will use their
knowledge of perpendicular and parallel lines and angle type to classify
two-dimensional figures. Students will identify line-symmetric figures and
draw lines of symmetry.

Recognize angles as geometric shapes that are formed
whenever two rays share a common endpoint, and understand concepts of angle
measurement:

a.An angle is measured with reference to a circle with its
center at the common endpoint of the rays, by considering the fraction of
the circular arc between the points where the two rays intersect the
circle.

b.An angle that turns through 1/360 of a circle is called a
“one-degree angle,” and can be used to measure angles.

c.An angle that turns through n one-degree
angles is said to have an angle measure of n degrees.

4.MD.6

Measure angles in whole-number degrees using a protractor.
Sketch angles of specified measure.

4.MD.7

Recognize angle measure as additive. When an angle is
decomposed into non-overlapping parts, the angle measure of the whole is
the sum of the angle measures of the parts. Solve addition and subtraction
problems to find unknown angles on a diagram in real world and mathematical
problems, e.g., by using an equation with a letter for the unknown angle
measure.

Classify two-dimensional figures based on the presence or
absence of parallel or perpendicular lines, or the presence or absence of
angles of a specified size. Recognize right triangles as a category, and
identify right triangles.

4.G.3

Recognize a line of symmetry for a two-dimensional figure as
a line across the figure such that the figure can be folded along the line
into matching parts. Identify line-symmetric figures and draw lines of
symmetry.

Enduring Understandings:

Geometric figures can be analyzed based on their
properties.

Geometric figures can be classified based on their
properties.

Lines of symmetry for a two-dimensional figure
occur when a line can be drawn across the figure such that the figure
can be folded along the line into matching parts.